Air dome and magnetic filter to automotive fuel pump lines



Dec. 1, 1959 J. F. WALDHERR, JR ,1

AIR DOME AND MAGNETIC FILTER T0 AUTOMOTIVE FUEL PUMP LINES Filed Jan. 8,1958 2 Sheets-Sheet l '7 A rroe/vs Y Dec. 1, 1959 J. F. WALDHERR, JR2,915,135

AIR DOME AND MAGNETIC FILTER T0 AUTOMOTIVE FUEL PUMP LINES Filed Jan. 8.1958 2 Sheets-Sheet 2 l 25 S 23 6 E2 25 INVENTOR. JOl/N KMLDHEEQ, J2.

ATTOE/VEX Am DoME AND-MAGNETIC FILTERI'T' AUTOMOTIVEIFUEL PUMP LINES:

John .Frwaldherr, Jr., Fairfield, lll., assignor to Air te x operativeeven when mounted upsidedown.

Pro'dilc'ts, Inc., Fairfield, 11]., a corporation of Illinois.

Application- January 8', 1958, Serial No. 707,760

4 Claims..- .(Cl. 210-422) device for use in connection with automotivefuel pumpss.

'mer 'eif'ects'l Ihe 'wallv carries at its .iipperm t.

The .commonly used automotive mechanical 'diaphra'gm;

fuel pump operates from an eccentric on the valve cam shaft on fourcycle combustion engines. The rise of the cam shaft eccentric causesgasoline to be sucked into the pumping cavity of the fuel. pump itselfthrough the action of rocker arm and linkage. On the return stroke ofthe cam shaft, the fuel is delivered to the carburetor. The same cyclerepeats itself with rotation of the cam shaft. The usual installationrequires a length of intake tubing of approximately twelve-foot length.Due to the fact that the intake stroke of the fuel pump is positive, itis necessary for the diaphragm to start to move the entire length offuel in the intake fuel tubing, and stop as directed by the lift of theeccentric on the cam shaft. This interrupted flow causes momentary highnegative pressures on the fuel in the intake line. It has been commonpractice to provide an internal air dome somewhere in the suction sideof the fuel pump. This acts as a surge chamber. The surge chamberpermits more uniform flow of fuel on the intake side of the fuel systemand especially in the intake tubing. These internally constructedchambers permit the fuel to continue moving forward toward the fuel pumpeven though the pump has entered the delivery portion of its operatingstroke. They also provide readily accessible supply of fuel and thisplus the air within the surge chamber itself permit the fuel pump todeliver more fuel and reduce the peaks of negative pressure which tendto cause vapor formations in thenow commonly used highly volatilegasolines.

Certain fuel pump designs now in common use have omitted theabove-mentioned internal surge chamber and as a result of the omission,these pumps are quite prone to excessive noise due to hydraulic hammerwithin the intake line, they are quite prone to causing vapor formation,they do cause excessive stress to be forced onto the entire pumpingmechanism and especially the flexible diaphragm.

Accordingly, it is an object of the present invention to overcome theabove difiiculties by means of an air dome serving as a surge chamberwhich may be readily inserted in a fuel line.

It is another object of the invention to provide a device which may bereadily manufactured and conveniently maintained.

It is a further object of the invention to provide a device havingmagnetic filtering means incorporated therein.

It is a still additional object of the invention to provide a devicehaving means for removing excess heat from fluid flowing therethrough.

It is a still additional object of my invention to provide a devicewhich, although intended to be mounted the other port as the outlet.

4 2,915,185 Pate iiited: Pee. 1, 1959.1,

in a eel-tats*iipfigfii iasiticii; 'is" onst'ruc ted as' to be...

is surmounted ajtransparent; bowbandlb'ein apl'oviriediiwith inlet andoutlet 'poi tsfandjj. bafile wallfl between the ports so thatfluidenteriri'g themes strikes the batheand is diverted upwardly andthereover to thez outlet, j there-being. a Space above theitfiuid' level.providedby the bowl "'tjo danipen' outjpuls'ajtions and hydrauli ham tP rti n a magnet pastwhicha l s'i bstaiitial portion thegfueL must; flowin; contact withibot poles thatany excessive quantities of iron" oxiderials which exist in Further, the fe sting ifs Pro allel "array and soarrange installed it is preferably .pps withi'non'n j fio p O p g Y theradiator fan, whereby a cooling eifect bn fluid in my device isachieved. This is important since sometimes just a few degrees oftemperature removal under conditions favorable to vapor lock willprevent vapor lock. Further, the construction of my device is such thatit is completely symmetrical and may be connected in the system witheither port serving as the inlet port and Finally, by a novel configuration of the casting, should the device be connected in a fuel linein upside down position, that is with the air dome bowl below the bodycasting, an air dome effect will still be achieved.

A detailed description of my invention will now be given in conjunctionwith the appended drawing in which:

Fig. 1 is an elevation of the device.

Fig. 2 is an elevation taken at orientation from the direction of theview of Fig. 1.

Fig. 3 is a section through 3-3 of Fig. 1.

Fig. 4 is a section through 4-4 of Fig. 2.

Fig. 5 is a view of the bottom of the device; and

Fig. 6 is a view in the direction 6-6 of Fig. 4.

Referring now to the drawing, my invention comprises a main bodycasting,-for example a die casting 10, having exteriorally providedthereon a series of spaced par-' allel fins 14 of progressively varyingarea from center to sides. The body casting is provided with ports 18and an internal bafiie wall 22 which is disposed transversely of thebody between flow guiding parallel walls 23 aligned with the directionof fuel flow between ports 18 and forming bulbous chambers 24 with theexternal wall of the casting.

The body has a skirt 25 for locating a gasket 28 which seals the lowerrim of a transparent bowl 31 secured on the body by means of a strap 34having the iuturned flanges 37 engaging a depression 40 at the closedend of the bowl. The ends of the strap are brought down around the bodyto a nut element 43 which threadedly carries a bolt 46 abutting thelowermost portion of the casting and it will be apparent that rotationof the bolt tightens the strap to securely hold the bowl on the body.

The wall 22 extends upwardly into a yoke 49 having ends 50 which may bepeened over to grip a round bar magnet 53 to secure the magnet withindome 31 and in the path of flow, between the ports 18.

Thus, it will be apparent that flow between the ports must for the mostpart contact the magnet ends, which are the poles, for the purpose offiltering out -by magnetic attraction any ferrous particles in the fuel.

In the event that an error in positioning is made at the time ofinstallation, i.e., were the device to be mounted in an upside downposition as compared with Fig. 3, fuel would still pass therethrough andair dome spacewould be aiforded by chambers 24 due to the bulbousnessofthe body; Accordingly, a surge pocket of air exists when the device ismounted right side up and it even exists if, due to error, it is mountedupside Having thus describedmy invention I am aware that variouschangesmaybe made therein without departing from the spirit thereof and,accordingly, I dolriot seek to be limited to the precise illustrationherein given except as set forth in the appended claims.

1. In a device of the class described, a body having an external walland a pair of spaced ports therethrough, a pair 'of spaced walls in saidbody extending between said ports, and an air dome element'icarried bysaid body and forming a'closed volume therewith, said body and saidspaced walls forming an'air' dome when said device is installed ininverted position,

2.-In a'device as set forth in claim '1",-'in'cluding 'a.

baflle wall extending between said spaced 'wallsfand a magnet carried bysaid bafile wall.

3. In a device as set forth in claim 2, said ports being in axialalignment, said spaced walls' extending parallel to each other onrespective diametrically opposite sides of said ports, said baffle wallextending in a direction normal to the axis of alignment of said portsand said -magnet being supported thereby beyond the confines of saidbody and within the volume of said air dome element.

4. In a device of the class described, a body having an external Walland a pair of spaced ports therethrough, a pair of spaced walls in saidbody extending between said ports, and an air dome element carried bysaid body and forming a closed volume therewith, said body havingchamber means formed by said spaced walls and said external Wall toserve as an air dome means when said body is inverted, said body havinga plurality of spaced fins on the exterior Wall thereof extendingexternally of said body.

References Cited in the file of this patent UNITED STATES PATENTS

